Perhaps you should try some spelling variations:
hoan hanh » hoan thanh, hon hanh, toan hanh
duc hoan » duc hoang, duc hoa, duc toan
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
ve cam » ve cac, va cam, ve cai
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) ky nang xa hoi. hieu ((ve cam) or (ve cham)) duc hoan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang xa hoi. hieu ((ve cam) OR (ve cham)) duc hoan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang xa hoi. hieu ((ve cam) or (ve cham)) duc hoan hanh vi cua tre*.